Four interior troops were killed and three others wounded when militants attacked an interior troops post in Chechnya\'s Vedeno district, a source in the Interior Troops headquarters in the North Caucasus told Interfax on Wednesday. The servicemen were attacked outside the village of Ishil-Khatoi overnight. \"Four servicemen were killed and three others, among them a senior officer, suffered wounds in the attack,\" the source said. A search operation has been launched. The militants\' losses have yet to be established. (Interfax-South)